Wear resisting ferrous alloy



' 2o many others,

Patented Sept. 13, 1932 H. ALTON MITCHELL AND ALFRED w. QBEGG, OF

BONNEY-FLOYD COMPANY, OF COLUMBUS,

WEAR BESISTING No Drawing.

This invention relates to a novel and improved wear resisting ferrousalloy which we have developed for use in the construction and formationof machine parts that are, in 6 use, subjected to friction, abrasion andother conditions tending to wear and render the' same unfit foreflicient service.

It has long been known that, for parts of machinery which must withstandsevere .wear, m abrasion and shock, a relatively soft body of materialsuch as steel, coated or surfaced with a much harder material, gives farsuperior results. The relatively softer body material has idealproperties to withstand shock without fracture, while the very hardsurface will withstand the abrasion and wear to which it may be.subjected. Cases in which our in I vention is especially applicable are,among dipper teeth, bucket lips, tool points, well drilling bits,conveyor parts, crushing rolls and etc. In most cases these parts aremade-up of a relatively soft base metal such as cast, rolled or forgedcarbon or, alloy steel which has inferior abrasion resistant properties.Our invention has partic- .ular reference to a material for applying asurface or coating on such cast, rolled or. forged material to greatlyincrease its useful life under conditions of -severe service;

The'alloy to which-this invention refers may be cast in suitable form'tocover and protect the parts subjected to wear by at- V taching' itthereto by .welding, mechanical means or it may beprepared in the formof welding rod and applied to these parts by any welding process such aselectric arc welding, 40 oxy-acetylene welding and the like. The lattermethod is usually preferred, but our invention is notto be limited tothis preferred method of application.

Broadly, the range of proportions of alloying elements in ourcomposition is as follows:

COLUMBUS OHIO, ASSIGNOBS- TO THE OHIO; A CORPORATION OF OHIO IERROUSALLOY Application filed January 16, 1980. Serial No. 421,806.

. Per cent the balance being iron, except for impurities such asphosphorus and sulphur, which are incidental to the manufacture.

A composition which we have used successfully is as follows:

An alloy of approximately the following composition I Per cent Tungsten4.00 Chromium 4. 00 Nickel a 1. 00 Carbon 3. 00 Manganese Silicon 1. 00Aluminum 50 Vanadium 1. 00

the balance being iron except for impurities such as phosphorus andsulphur, which are incidental to the manufacture. This alloy whenapplied to the wearing parts of dipper teeth and the like has increasedtheir useful life in many cases as much as tenfold. The resistance toabrasion ,is a direct result of the extreme hardness of the materialwhich in most cases is in excess of 700 measured on standard Brinellhardness scale. This ex:

treme hardness is broughtabout by the pe-.

culiar combination of the alloysused and malntalned without any Ihardening heat treatment such as isrequlred by many of theso-called toolsteels.

' One of the outstanding features of this alloy resides in the fact thatit fuses at arelatively low temperature, considerably below the fusingtemperature of other hardening Tungsten 1.00 to 12.00 Chromium 1.00 to10. 00 Nickel 10 t0 5. 00 Aluminum 10 "to 8. 00 Vanadium 10 to 2. 00Carbon 1.75 to 4.00 Manganese...- 50 to 5. 00 S1l1con .20 to 3.00

alloys now in use for similar purposes. This low fusing temperature isof very great importance in the matter of avoiding injury to therelatively softer materials to which the alloy is applied. Again, thealloy is both economical to produce and apply and its application to asofter body of metal increases many times the ordinary life of thelatter with accompanying economy in the matter of maintaining a machineso protected in prolonged use and operation. This last factor is ofconsiderable importance in the operation of many large machines whereinthe time required to replace worn parts is of far greater economicimportance than the mere value of the worn or substituted parts.

Molybdenum may be added to the above compositions in amounts from .10%to 6.00%. Examples of such a composition are as follows:

Per cent Tungsten 1. 00 to 12. 00 Chromium -1. 00 to 10. 00 Nickel 10 to5. 00 Aluminum 10 to 8. 00 Vanadium 10 to 2. 00 Carbon 1.75 to 4.00Manganese 50 to 5. 00 Silicon 20 to 3. 00 Molybdenum 10 to 6. 00

the balance being iron except for impurities such as phosphorus andsulphur, which are incidental to the manufacture.

Per cent Tungsten 2. 00 to 6. 00 Chromium 2. 00 to 6. 00 Nickel 50 t0 3.00 Aluminum 10 to 4. 00 Vanadium 10 to 1. 00 Carbon 2. 00 to 3. 50Manganese 50 to 2. 00 Silicon 20 to 2. 00 Molybdenum 3. 00 to 6. 00

the balance being iron except for impurities such as phosphorus andsulphur, which are incldental to the manufacture.

' Per cent Tungsten 4.00 Chromium 4.00 Nickel 1.00 Carbon 3. 00Manganese .75 Silicon 1. 00 Molybdenum 5.00 Aluminum .50 Vanadium 1. 00

the balance being iron except for impurities such as phosphorus andsulphur, which are incidental to the manufacture.

While the invention has been described in detail, particularly withreference to the matter of the specific composition and preparation ofthe materials entering into the formation of our improved alloy, yet itwill be understood that we do not limit ourselves to the exact formulagiven but reserve the right to employ such variations or equivalentsthat can be said to fall within the scope and spirit of the followingclaims.

\Vhat is claimed is:

1. An alloy welding rod containing 1.00% to 12.00% tungsten, 1.00% to10.00% chromium, .10% to 5.00% nickel, 10% to 8.00% aluminum, .10% to2.00% vanadium, 1.75% to 4.00% carbon, .50% to 5.00% manganese, .20% to3.00% silicon, the balance being iron except for impurities such asphosphorus and sulphur, which are incidental to the manufacture.

2. An alloy welding rod containing 2.00% to 6.00% tungsten, 2.00% to6.00% chromium, .50% to 3.00% nickel, .10% to 4.00% aluminum, 10% to1.00% vanadium, 2.00% to 3.50% carbon, .50% to 2.00% manganese, 20% to2.00% silicon, the balance being iron except for impurities such asphosphorus and sulphur, which are incidental to the manuthe balancebeing iron except for impurities such as phosphorus and sulphur, whichare incidental to the manufacture.

4. An alloy welding 'rod containing 1.00% to 12.00% tungsten, 1.00% to10.00% chromium, .10% to 5.00% nickel, 10% to 8.00% aluminum, .10% to2.00% vanadium, 1.75% to 4.00% carbon, .50% to 5.00% manganese, .20% to3.00% silicon, .10% to 6.00% molybdenum, the balance being iron exceptfor impurities such as phosphorus and sulphur, which are incidental tothe manufacture.

5. An alloy welding rod containing 2.00% to 6.00% tungsten, 2.00% to6.00% chromium, .50% to 3.00% nickel, .10% to 4.00%

aluminum, .10% to 1.00% vanadium, 2.00%

to 3.50% carbon, .50% to 2.00% manganese. 20% to 2.00% silicon, 3.00% to6.00% molyb' denum, the balance being iron except for impurities such asphosphorus and sulphur, which are incidental to the manufacture.

6. An alloy welding rod of approximately the following composltion:

Per cent Tungsten 1 4. 00 .Chromium 4.00 NickeL 1.00 Carbon 3.00Manganese .75 Silicon 1.00 Molybdenum 5.00 Aluminumu; .50 Vanadium 1.00

the balance being iron except for impurities such as phosphorus andsulphur, whioh are incidental to the manufacture.

Intestimony whereof we aflix our signatures.

H. ALTON MITCHELL. ALFRED W. GREGG.

